短波OFDM通信系统信号采集器的设计与实现

正交频分复用（OFDM）技术具有频谱利用率高、抗多径能力强、带宽扩展性好等优点,因此其适应了短波通信的发展要求。但是收发两端的信号采样频率差会对通信效果造成不良影响,必须采取措施消除这个频率差。因此设计并实现了基于温补晶振的高稳定度信号采集器。经过试验比较发现该文设计的信号采集器可以消除由于采样频差对通信带来的影响,采集器的交互界面也可以方便快捷地观察通信的进程和效果。     

基于雷达视频的Huffman编码研究

讨论在雷达视频传输中所运用到的数据压缩算法，论述采用霍夫曼码对雷达数据进行编解码，以解决大容量雷达数据传输，满足雷达视频图像数据实时、高速、尤损传输的要求。     

基于视频优化技术的舰船导航交互界面设计

针对舰船航行导航需求,设计基于视频优化技术的舰船导航交互界面。利用导航设备单元内的气象仪、GPS、海图等直接获取导航所需数据,同时利用雷达采集器采集雷达扫描视频,将舰船导航所需数据和雷达扫描视频传输到视频优化单元内和人机交互单元内,视频优化单元对雷达扫描视频与气象仪、GPS、海图等数据进行优化融合处理,得到涵盖气象、海图等数据的雷达扫描视频后。将其发送到主控单元内电子海图控制模块内,同时主控单元连接触控显示屏为用户连接人机交互单元,实现电子海图控制、导航定位管理等。实验结果表明,该舰船导航交互界面具备较好的雷达扫描视频生成能力,电子海图背景海图缩放功能等,应用效果较佳。     

油船舱内液面高度测量雷达系统

本文介绍一种微波雷达舱内液位高度测量系统，该系统推广了一般调频连续波雷达的测距原理，利用ＦＦＴ技术从雷达回波信号的频率和相位中提取距离信息，并采用高速信号处理芯片ＤＳＰ实现雷达信号的实时处理，实验结果表明该系统的距离测量精度可以达到１ｍｍ。     

基于嵌入式平台的软件雷达设计

首先介绍软件雷达和组网式软件雷达的概念。利用在可编程器件内部构建嵌入式计算平台实现高速数字信号处理、I/Q基带数据产生、参数配置和数据通信等功能,同时在具有并行处理能力的运算处理引擎中利用软件实现雷达的各种功能;然后对嵌入式计算平台搭建进行详细的说明,分析利用嵌入式运算平台进行数据传输的可行性;最后比较不同嵌入式操作系统下的网络性能。     

基于嵌入式平台的软件雷达设计

首先介绍软件雷达和组网式软件雷达的概念.利用在可编程器件内部构建嵌入式计算平台实现高速数字信号处理、I/Q基带数据产生、参数配置和数据通信等功能,同时在具有并行处理能力的运算处理引擎中利用软件实现雷达的各种功能;然后对嵌入式计算平台搭建进行详细的说明,分析利用嵌入式运算平台进行数据传输的可行性;最后比较不同嵌入式操作系统下的网络性能.     

雷达隐身与反隐身技术浅析

现代雷达兼具隐身与反隐身双重特性才能在战场环境中处于优势地位。从最近几场战争的实践表明,在综合电子干扰的支援下,具有隐身目标特性的反辐射导弹或高速飞机,采用低空或超低空飞行战术对雷达进行攻击,对现代雷达构成致命威胁。因此,讨论雷达在综合电子战环境下实现隐身和反隐身尤为必要。     

雷达通用数据链发展概述

雷达通用数据链是在雷达平台上实现高速数据传输的链路。2005年美国在战术数据链基础上提出这一新概念,主要针对机载有源相控阵雷达。目前正在处于实验验证阶段,前期演示已经在F-22战机上取得成功。文章选取了三个不同年代的比较具有代表性的系统来介绍了雷达通信的发展过程。首先分析了机械体制雷达如何实现数据通信,其次是支援飞机与巡航飞机之间如何利用机载雷达实现大容量数据传输,最后重点研究了基于机载相控阵雷达的通信一体化技术,给出了其详细的通信原理。     

船用雷达的安装施工工艺

雷达在船舶通信导航系统中始终占据着举足轻重的地位。一台性能优异的雷达应具有准确的目标识别功能及良好的抗干扰能力，同时能够提供标准接口与外围设备进行畅通无阻的通信及数据交换。本文结合德国STN公司生产的ATLAS-9600雷达及在高速集装箱船上的实践经验。对雷达设计布局、施工工艺进行了总结，并提出一些建设性意见。     

雷达去天线架设及维修检测系统的设计

在特殊情况下，对船舶维修保障部门配备的雷达样机进行架设和辅助维修检测时，常面临着威胁工作人员安全、无架设条件、无法隐蔽发射以及维修检测困难等诸多问题。文章设计了一种雷达去天线架设及维修检测系统，该系统采用微波馈线技术、高Q值谐振腔技术、微控制器技术和直接数字式频率合成器技术，实现了雷达信号的吸收、提取和检测，产生了雷达去天线架设和维修检测所需的各种信号，满足了实际使用要求。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

网络存储备份应用技术研究

本文分析了企业在新的信息时代对数据存储与备份的发展需求,对当前的主流网络存储与备份技术进行了分析比较,并结合了本单位的实施情况进行总结,对企业建设存储备份系统具有一定的参考意义.     

某海港码头的撞损修复

依据码头撞击受损区域调查检测结果,对受损构件提出合理的修复方案,为码头的安全运行提供保障。